Thanks for your report. Please revert xorg, firefox, thunderbird, banshee (and maybe others) from PPA to the version from the official Ubuntu repository. You can use ppa-purge to help you with this.
I'm closing this report because it is not a bug with Ubuntu. Don't hesitate to submit any new bug. ** Changed in: update-manager (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/777238 Title: Update Manager (Could not Calculate the Upgrade) from 10.10 to 11.04 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs